The leftist elected leader of South Korea and North Korea’s megalomaniacal tyrant performed a highly choreographed diplomatic mating-dance today, touting unity on the Korean peninsula and setting the stage for President Donald Trump and the North’s Kim Jong-un to do the same.

Unfortunately, South Korea’s Moon Jae-in seems to be seeking a separate peace with the North. That would legitimate, and help perpetuate the horrifyingly brutal North Korean regime. In the name of “unification,” the South seems set to restart on steroids an earlier, failed inter-Korean détente called the “Sunshine Policy.”

That threatens the united front that has created real pressure on Kim actually to fulfill his promised elimination of North Korea’s nuclear arsenal. It could enable him to continue the brutal repression of his long-suffering people and undermine President Trump’s efforts to keep him from threatening the rest of us.